1 ;;;; This software is part of the SBCL system. See the README file for
4 ;;;; This software is derived from the CMU CL system, which was
5 ;;;; written at Carnegie Mellon University and released into the
6 ;;;; public domain. The software is in the public domain and is
7 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
8 ;;;; files for more information.
10 (in-package "SB!KERNEL")
12 ;;; (Note that when cross-compiling, SB!XC:TYPEP is interpreted as a
13 ;;; test that the host Lisp object OBJECT translates to a target SBCL
14 ;;; type TYPE. This behavior is needed e.g. to test for the validity
15 ;;; of numeric subtype bounds read when cross-compiling.)
16 (defun typep (object type &optional environment)
18 "Is OBJECT of type TYPE?"
19 (declare (ignore environment))
20 ;; Actually interpreting types at runtime is done by %TYPEP. The
21 ;; cost of the extra function call here should be negligible
22 ;; compared to the cost of interpreting types. (And the compiler
23 ;; tries hard to optimize away the interpretation of types at
24 ;; runtime, and when it succeeds, we never get here anyway.)
27 ;;; the actual TYPEP engine. The compiler only generates calls to this
28 ;;; function when it can't figure out anything more intelligent to do.
29 (defun %typep (object specifier)
31 (if (ctype-p specifier)
33 (specifier-type specifier))))
34 (defun %%typep (object type)
35 (declare (type ctype type))
38 (ecase (named-type-name type)
43 (let (;; I think this works because of an invariant of the
44 ;; two components of a COMPLEX are always coerced to
45 ;; be the same, e.g. (COMPLEX 1.0 3/2) => #C(1.0 1.5).
46 ;; Dunno why that holds, though -- ANSI? Python
47 ;; tradition? marsh faerie spirits? -- WHN 2001-10-27
48 (num (if (complexp object)
51 (ecase (numeric-type-class type)
52 (integer (integerp num))
53 (rational (rationalp num))
55 (ecase (numeric-type-format type)
56 (short-float (typep num 'short-float))
57 (single-float (typep num 'single-float))
58 (double-float (typep num 'double-float))
59 (long-float (typep num 'long-float))
60 ((nil) (floatp num))))
62 #!-negative-zero-is-not-zero
63 (flet ((bound-test (val)
64 (let ((low (numeric-type-low type))
65 (high (numeric-type-high type)))
66 (and (cond ((null low) t)
67 ((listp low) (> val (car low)))
70 ((listp high) (< val (car high)))
71 (t (<= val high)))))))
72 (ecase (numeric-type-complexp type)
75 (and (complexp object)
76 (bound-test (realpart object))
77 (bound-test (imagpart object))))
79 (and (not (complexp object))
80 (bound-test object)))))
81 #!+negative-zero-is-not-zero
82 (labels ((signed-> (x y)
83 (if (and (zerop x) (zerop y) (floatp x) (floatp y))
84 (> (float-sign x) (float-sign y))
87 (if (and (zerop x) (zerop y) (floatp x) (floatp y))
88 (>= (float-sign x) (float-sign y))
91 (let ((low (numeric-type-low type))
92 (high (numeric-type-high type)))
93 (and (cond ((null low) t)
95 (signed-> val (car low)))
100 (signed-> (car high) val))
102 (signed->= high val)))))))
103 (ecase (numeric-type-complexp type)
106 (and (complexp object)
107 (bound-test (realpart object))
108 (bound-test (imagpart object))))
110 (and (not (complexp object))
111 (bound-test object)))))))
114 (ecase (array-type-complexp type)
115 ((t) (not (typep object 'simple-array)))
116 ((nil) (typep object 'simple-array))
118 (or (eq (array-type-dimensions type) '*)
119 (do ((want (array-type-dimensions type) (cdr want))
120 (got (array-dimensions object) (cdr got)))
121 ((and (null want) (null got)) t)
122 (unless (and want got
123 (or (eq (car want) '*)
124 (= (car want) (car got))))
126 (if (unknown-type-p (array-type-element-type type))
127 ;; better to fail this way than to get bogosities like
128 ;; (TYPEP (MAKE-ARRAY 11) '(ARRAY SOME-UNDEFINED-TYPE)) => T
129 (error "~@<unknown element type in array type: ~2I~_~S~:>"
130 (type-specifier type))
132 (or (eq (array-type-element-type type) *wild-type*)
133 (values (type= (array-type-specialized-element-type type)
134 (specifier-type (array-element-type
137 (if (member object (member-type-members type)) t))
139 #+sb-xc-host (ctypep object type)
140 #-sb-xc-host (class-typep (layout-of object) type object))
142 (some (lambda (union-type-type) (%%typep object union-type-type))
143 (union-type-types type)))
145 (every (lambda (intersection-type-type)
146 (%%typep object intersection-type-type))
147 (intersection-type-types type)))
150 (%%typep (car object) (cons-type-car-type type))
151 (%%typep (cdr object) (cons-type-cdr-type type))))
153 ;; dunno how to do this ANSIly -- WHN 19990413
154 #+sb-xc-host (error "stub: %%TYPEP UNKNOWN-TYPE in xcompilation host")
155 ;; Parse it again to make sure it's really undefined.
156 (let ((reparse (specifier-type (unknown-type-specifier type))))
157 (if (typep reparse 'unknown-type)
158 (error "unknown type specifier: ~S"
159 (unknown-type-specifier reparse))
160 (%%typep object reparse))))
162 (not (%%typep object (negation-type-type type))))
164 ;; Now the tricky stuff.
165 (let* ((hairy-spec (hairy-type-specifier type))
166 (symbol (car hairy-spec)))
169 (every (lambda (spec) (%%typep object (specifier-type spec)))
171 ;; Note: it should be safe to skip OR here, because union
172 ;; types can always be represented as UNION-TYPE in general
173 ;; or other CTYPEs in special cases; we never need to use
174 ;; HAIRY-TYPE for them.
176 (unless (proper-list-of-length-p hairy-spec 2)
177 (error "invalid type specifier: ~S" hairy-spec))
178 (not (%%typep object (specifier-type (cadr hairy-spec)))))
180 (unless (proper-list-of-length-p hairy-spec 2)
181 (error "invalid type specifier: ~S" hairy-spec))
182 (values (funcall (symbol-function (cadr hairy-spec)) object))))))
184 (sb!alien-internals:alien-typep object (alien-type-type-alien-type type)))
186 (error "Function types are not a legal argument to TYPEP:~% ~S"
187 (type-specifier type)))))
189 ;;; Do a type test from a class cell, allowing forward reference and
191 (defun class-cell-typep (obj-layout cell object)
192 (let ((class (class-cell-class cell)))
194 (error "The class ~S has not yet been defined." (class-cell-name cell)))
195 (class-typep obj-layout class object)))
197 ;;; Test whether OBJ-LAYOUT is from an instance of CLASS.
198 (defun class-typep (obj-layout class object)
199 (declare (optimize speed))
200 (when (layout-invalid obj-layout)
201 (if (and (typep (sb!xc:class-of object) 'sb!xc:standard-class) object)
202 (setq obj-layout (sb!pcl::check-wrapper-validity object))
203 (error "TYPEP was called on an obsolete object (was class ~S)."
204 (class-proper-name (layout-class obj-layout)))))
205 (let ((layout (class-layout class))
206 (obj-inherits (layout-inherits obj-layout)))
207 (when (layout-invalid layout)
208 (error "The class ~S is currently invalid." class))
209 (or (eq obj-layout layout)
210 (dotimes (i (length obj-inherits) nil)
211 (when (eq (svref obj-inherits i) layout)
214 ;;; This implementation is a placeholder to use until PCL is set up,
215 ;;; at which time it will be overwritten by a real implementation.
216 (defun sb!pcl::check-wrapper-validity (object)